| 摘要 |
PCT No. PCT/EP96/04635 Sec. 371 Date Jul. 12, 1997 Sec. 102(e) Date Jul. 12, 1997 PCT Filed Oct. 25, 1996 PCT Pub. No. WO97/21545 PCT Pub. Date Jun. 19, 1997A powder-dusting apparatus (4) which inside a printing machine dusts the pre-dried printed products coming from the printing unit with a powder, for example of corn-starch, comprises in a manner known per se a plurality of nozzles (6), which are charged with a mixture of powder and carrying air from a mixing device (8). The nozzles (6) are arranged in the vicinity of the plane of transport defined by the transport system (1) of the printing machine and are able to assume two different spacings with respect to that plane: ordinarily the nozzles (6) are located comparatively close to this plane of transport; during these times the mixture of powder and carrying air emerges from the nozzles (6) towards the printed products moving past. If, however, a gripping device (2), which is part of the transport system (1) and which holds the printed product, enters the vicinity of the nozzles (6), a suitable control means (9 to 12) causes the nozzles to move into a second position. In this position there is between the underside of the nozzles (6) and the plane of transport of the transport system (1) sufficient space for the gripping device (2) to be able to pass.
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